/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2002,2003-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.impl.xs.util;

import java.util.AbstractList;

import com.sun.org.apache.xerces.internal.xs.ShortList;
import com.sun.org.apache.xerces.internal.xs.XSException;

/**
 * Containts a list of Object's.
 *
 * @author Sandy Gao, IBM
 * @version $Id: ShortListImpl.java,v 1.7 2010-11-01 04:40:06 joehw Exp $
 * @xerces.internal
 */
public final class ShortListImpl extends AbstractList implements ShortList {

  /**
   * An immutable empty list.
   */
  public static final ShortListImpl EMPTY_LIST = new ShortListImpl(new short[0], 0);

  // The array to hold all data
  private final short[] fArray;
  // Number of elements in this list
  private final int fLength;

  /**
   * Construct an XSObjectList implementation
   *
   * @param array the data array
   * @param length the number of elements
   */
  public ShortListImpl(short[] array, int length) {
    fArray = array;
    fLength = length;
  }

  /**
   * The number of <code>Objects</code> in the list. The range of valid
   * child node indices is 0 to <code>length-1</code> inclusive.
   */
  public int getLength() {
    return fLength;
  }

  /**
   * Checks if the <code>unsigned short</code> <code>item</code> is a
   * member of this list.
   *
   * @param item <code>unsigned short</code> whose presence in this list is to be tested.
   * @return True if this list contains the <code>unsigned short</code> <code>item</code>.
   */
  public boolean contains(short item) {
    for (int i = 0; i < fLength; i++) {
      if (fArray[i] == item) {
        return true;
      }
    }
    return false;
  }

  public short item(int index) throws XSException {
    if (index < 0 || index >= fLength) {
      throw new XSException(XSException.INDEX_SIZE_ERR, null);
    }
    return fArray[index];
  }

  public boolean equals(Object obj) {
    if (obj == null || !(obj instanceof ShortList)) {
      return false;
    }
    ShortList rhs = (ShortList) obj;

    if (fLength != rhs.getLength()) {
      return false;
    }
    for (int i = 0; i < fLength; ++i) {
      if (fArray[i] != rhs.item(i)) {
        return false;
      }
    }
    return true;
  }

    /*
     * List methods
     */

  public Object get(int index) {
    if (index >= 0 && index < fLength) {
      return new Short(fArray[index]);
    }
    throw new IndexOutOfBoundsException("Index: " + index);
  }

  public int size() {
    return getLength();
  }

} // class ShortListImpl
